ATLANTA -- In the era of tweets, posts, likes and Instagrams, regulating kids' online activities is enough to make any parent's head spin.

But if you think friending your child on Facebook is enough to keep questionable behavior at bay, you may want to think again.

Many tech-savvy teens have moved beyond Facebook and Twitter, and are using other social networking sites.

11Alive anchor Elle Duncan put together a list of some of the lesser-known sites that are becoming popular with teens.

InstagramInstagram is an online photo-sharing and social networking service that allows users to take pictures, apply digital filters to them, and share them on a variety of social networks at once, including Facebook and Twitter. As of last year, Instagram has more than 100 million registered users.

TumblrThis is less of a social networking profile site and more of a social blog. Tumblr is quickly becoming teenagers' social network of choice. Individual blogs are called tumblelogs, and users can post text, images, video, links and audio files to them. More than 50 percent of Tumblr visitors are under age 35.

PinterestThis is a pinboard-style photo-sharing website that allows users to create and manage theme-based image collections, such as events, interests and hobbies. Users can browse other pinboards for images, re-pin images to their own pinboards and "like" photos.

FlickrThe original image- and video-hosting website, Flickr was created in 2004 and is widely used by bloggers to host images that they embed to blogs and social media. As of 2012, Yahoo! reported that Flickr had a total of 51 million registered members.

SnapchatQuickly becoming one of the fastest-growing modes for teens and social media, Snapchat is a photo messaging phone app where users can take pictures, record video and send everything to friends. Snapchat's unique feature is the sender's ability to set a timer and control how long the picture or video is viewable. This feature has experts fearing Snapchat could becoming the No. 1 vehicle for sexting among teens.

iMessageThis is an instant messaging service unique to Apple products. Users send messages over Wi-Fi rather than the traditional mode of SMS delivery on other smartphones.

Google+Currently the second-largest social networking site, Google+ surpassed Twitter in January 2013. More than 500 million registered users can sync calendars, photos, Gmail and all other Google features on their unique pages. Google+ has been described as a "social layer."

VineVine is a free mobile app that enables users to record and share an unlimited number of short looping video clips with a maximum length of six seconds. It was acquired by Twitter in October 2012 and debuted in January 2013, and is currently available for free from the Apple Store. Vine users can video others' videos and post their own to Facebook and Twitter as well.WATCH | Karyn and Jeff demonstrate Vine

Kik MessengerA free real-time texting app that is similar to the function and appearance of BlackBerry Messenger, Kik Messenger is used on iPhones, iPads and Android devices.

4chanThis image-hosting site is sometimes known for shockingly graphic and sexual imagery. Users can upload or download pictures from the Internet in an "open forum" setting, giving the site a reputation as the epitome of "not safe for work."

WaneloWanelo is the online community for people who love to shop. Derived from the words "want, need, love," Wanelo displays various images of products and clothes similar to Pinterest, but online its social networking cousin, Wanelo gives an option to click and purchase those items instantly.